Captain Nemo pointed to this prodigious heap of shellfish, and I saw that these mines were genuinely inexhaustible, since nature's creative powers are greater than man's destructive instincts. True to those instincts, Ned Land greedily stuffed the finest of these mollusks into a net he carried at his side.

But we couldn't stop. We had to follow the captain, who headed down trails seemingly known only to himself. The seafloor rose noticeably, and when I lifted my arms, sometimes they would pass above the surface of the sea. Then the level of the oysterbank would lower unpredictably. Often we went around tall, pointed rocks rising like pyramids. In their dark crevices huge crustaceans, aiming their long legs like heavy artillery, watched us with unblinking eyes, while underfoot there crept millipedes, bloodworms, aricia worms, and annelid worms, whose antennas and tubular tentacles were incredibly long.

Just then a huge cave opened up in our path, hollowed from a picturesque pile of rocks whose smooth heights were completely hung with underwater flora. At first this cave looked pitch-black to me. Inside, the sun's rays seemed to diminish by degrees. Their hazy transparency was nothing more than drowned light.

Captain Nemo went in. We followed him. My eyes soon grew accustomed to this comparative gloom. I distinguished the unpredictably contoured springings of a vault, supported by natural pillars firmly based on a granite foundation, like the weighty columns of Tuscan architecture. Why had our incomprehensible guide taken us into the depths of this underwater crypt? I would soon find out.

After going down a fairly steep slope, our feet trod the floor of a sort of circular pit. There Captain Nemo stopped, and his hand indicated an object that I hadn't yet noticed.

It was an oyster of extraordinary dimensions, a titanic giant clam, a holy-water font that could have held a whole lake, a basin more than two meters wide, hence even bigger than the one adorning the Nautilus's lounge.

I approached this phenomenal mollusk. Its mass of filaments attached it to a table of granite, and there it grew by itself in the midst of the cave's calm waters. I estimated the weight of this giant clam at 300 kilograms. Hence such an oyster held fifteen kilos of meat, and you'd need the stomach of King Gargantua to eat a couple dozen.

Captain Nemo was obviously familiar with this bivalve's existence. This wasn't the first time he'd paid it a visit, and I thought his sole reason for leading us to this locality was to show us a natural curiosity. I was mistaken. Captain Nemo had an explicit personal interest in checking on the current condition of this giant clam.

The mollusk's two valves were partly open. The captain approached and stuck his dagger vertically between the shells to discourage any ideas about closing; then with his hands he raised the fringed, membrane-filled tunic that made up the animal's mantle.

There, between its leaflike folds, I saw a loose pearl as big as a coconut. Its globular shape, perfect clarity, and wonderful orient made it a jewel of incalculable value. Carried away by curiosity, I stretched out my hand to take it, weigh it, fondle it! But the captain stopped me, signaled no, removed his dagger in one swift motion, and let the two valves snap shut.

I then understood Captain Nemo's intent. By leaving the pearl buried beneath the giant clam's mantle, he allowed it to grow imperceptibly. With each passing year the mollusk's secretions added new concentric layers. The captain alone was familiar with the cave where this wonderful fruit of nature was "ripening"; he alone reared it, so to speak, in order to transfer it one day to his dearly beloved museum. Perhaps, following the examples of oyster farmers in China and India, he had even predetermined the creation of this pearl by sticking under the mollusk's folds some piece of glass or metal that was gradually covered with mother-of-pearl. In any case, comparing this pearl to others I already knew about, and to those shimmering in the captain's collection, I estimated that it was worth at least 10,000,000 francs.